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Jul 21st, 2025 | | | | Joined: Apr 2002 Posts: 2,168 A teacher, but always an apprentice. | | A teacher, but always an apprentice. Joined: Apr 2002 Posts: 2,168 | Reinstalled the transmission sm420 and in preparation installed the gear shifter. What a sloppy mess! Upon inspection the "dowel pins" on the top of the Trans cover plate were worn right out. Well, being handy (cheap) I wanted to tighten the gear shift up so to speak so it didn't flop all over the place.
Here's what I did.
1. Plug inside of gear shift hole with clean rag.
2. Lightly grind the outside of dowel flush to cover.
3. Punch out the dowel pins.
4. Get a 5/16" bolt with a shoulder on it. Cut off head. Cut shoulder to proper length to match the dowel on the inside of gear shifter hole.
5. Drill the dowel hole out larger (17/64" if I remember) to accommodate a 5/16" tap. Place a small magnet inside of hole to catch filings with that clean rag under it.
6. Install the shouldered bolt from the inside of the gear shifter hole outwards. I used needle nose vice grips and applied loctite to ensure it is secure. Cut off extruding tails of bolts.
7. Test fit/adjust as necessary to tighten up fit.
8. When satisfied reinstall shifter to see how it feels.
I used grade 8 hardware
This was quite easy, fast and is adjustable to suit your taste as to how much wobble you want in your 4speed shifter.
Last edited by Fox; 11/28/2018 5:19 AM.
| | | | | Joined: Aug 2004 Posts: 1,400 ODSS Lawman | | ODSS Lawman Joined: Aug 2004 Posts: 1,400 | Have any photos?
If so we may have a Tech Tip in the making
Good job!
SWEET Sergeant At Arms: Old Dominion Stovebolt Society BUNS?!?!?!Where we're going, we don't need no buns.....1950 GMC 450 1951 Chevy 1/2-TonThe GreenMachineIn the Stovebolt Gallery | | | | | Joined: May 2005 Posts: 8,877 . | | . Joined: May 2005 Posts: 8,877 | My first attempt as such repair I removed the old pins, reamed for 5/16" and tapped a short spring pin, or roll pin, in each side.
I'm about ready to do another and plan to just make up new pins as original and rivet them (peen over the outside) as they were.
I intend to make a little adjustable tool to hold the pins while riveting.. I'll take some pictures when I get to it.
Thanks for sharing,
Grigg
| | | | | Joined: Sep 2012 Posts: 306 'Bolter | | 'Bolter Joined: Sep 2012 Posts: 306 | ** Thanks for the great ideas. ** The fix presented by Fox seems like a very good fix if your not locked into being original. Thanks To All ** | | |
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